Tell her to come over?
From Create Your Own Story
"Come here for a second, sis, I need some help real quick." She hesitates, but after a second she obediently walks over to your bed and climbs in. "Lay next to me." She does without a word. You release your cock for a moment to pull off her shirt and panties, leaving her shivering naked in your bed. You keep jerking your cock as you kiss her warm little body from her cheek to her neck to her nipples to her pussy, and before long you feel a powerful orgasm work up.
You straddle her, your cock poised over her body. You manage to grunt to her "Get ready!" before cumming so hard you almost pass out. You blow a huge load for her, covering her exposed skin in your hot cum. With each stroke you shoot more and more jizz, and by the time your balls are empty she is covered from her pussy to her forehead in your young cum.
You collapse on the bed next to her and give her a wink. After a few moments of exhaustion you stand up and wipe her off with the towel you used last night after your shower. She pulls her clothes on and runs out the door without a word.
What do you do?